A vibration exciting and damping integrated device

Abstract

This invention discloses an integrated vibration excitation and damping device, comprising: a support frame; a motor drive mechanism disposed on the support frame; a base plate connected to and driven by the motor drive mechanism to perform vertical reciprocating motion; a mass block installed in the middle of the base plate; a lead screw transmission assembly including a lead screw nut and a lead screw cooperating with the lead screw nut, the lead screw nut being disposed on the support frame, and the lead screw being connected to the mass block; a flywheel rotatably sleeved on the lead screw and connected to the lead screw nut; and a spring mechanism comprising multiple springs, one end of each spring being connected to the base plate, and the other end being connected to the bottom of the support frame. This invention achieves integrated vibration excitation and damping functions by organically combining mechanical inertia tuning, elastic recovery, resistive damping, and active drive, enabling stable operation under both bridge dynamic testing and operational vibration reduction conditions.

Description

Technical Field

[0001] This invention relates to the field of bridge structure technology, and in particular to an integrated vibration excitation and damping device. Background Technology

[0002] With the increasing number of long-span bridges and the growing flexibility of their structural systems, bridges are becoming significantly more sensitive to wind loads, vehicle loads, and environmental effects during operation. To accurately obtain the bridge's natural frequency, damping ratio, mode shape, and other dynamic characteristic parameters, it is typically necessary to use external vibration equipment to apply controlled excitation to the bridge for dynamic response testing and structural condition identification. However, existing bridge vibration equipment is generally bulky, inconvenient to transport and install, and cannot meet the needs of rapid on-site deployment for large bridges. Furthermore, when the bridge's dominant frequency is extremely low, traditional auxiliary mass devices require a large mass to achieve the desired control effect, which is often impractical in engineering. Their insufficient excitation capacity and adaptability fail to meet the requirements for high-precision dynamic characteristic identification of bridges. On the other hand, long-span bridges, especially wind-sensitive bridges, are prone to wind-induced vibrations such as flutter and vortex-induced vibration under the action of strong winds and gusts, which affect structural durability, driving comfort and operational safety. Therefore, it is necessary to configure mechanical vibration reduction devices to effectively control bridge vibration. However, existing vibration excitation equipment and vibration reduction devices are mostly set up independently, with dispersed functions and insufficient coordination, making it difficult to meet the dual needs of bridge dynamic testing and operational vibration reduction. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this invention is to provide an integrated excitation and vibration reduction device.

[0004] To achieve the above objectives, an embodiment of the present invention provides the following technical solution:

[0005] An integrated vibration excitation and damping device, comprising:

[0006] Support frame;

[0007] The motor drive mechanism is mounted on the support frame;

[0008] The substrate is connected to the motor drive mechanism and is driven by the motor drive mechanism to perform vertical reciprocating motion;

[0009] A mass block is installed in the middle of the substrate;

[0010] A lead screw drive assembly includes a lead screw nut and a lead screw that cooperates with the lead screw nut, the lead screw nut being disposed on the support frame, and the lead screw being connected to the mass block;

[0011] A flywheel is rotatably mounted on the lead screw and connected to the lead screw nut;

[0012] A spring mechanism comprising a plurality of springs, each spring having one end connected to the base plate and the other end connected to the bottom of the support frame.

[0013] As a further improvement of the present invention, the support frame includes an inner support frame and an outer support frame connected to the inner support frame, the lead screw nut is disposed on the inner support frame, and the motor drive mechanism is disposed on the outer support frame.

[0014] As a further improvement of the present invention, the inner support frame includes a base, two vertical side plates connected to the base and arranged opposite to each other, and a transverse support plate connected to the two vertical side plates. The lead screw nut is disposed on the transverse support plate, and the transverse support plate is located above the base plate.

[0015] As a further improvement of the present invention, the substrate is sleeved outside the two vertical side plates.

[0016] As a further improvement of the present invention, the outer support frame includes two support plates arranged opposite to each other, one end of each support plate is connected to the corresponding vertical side plate, and the other end is connected to the base, and the motor drive mechanism is disposed on the two support plates.

[0017] As a further improvement of the present invention, the motor drive mechanism includes two linear motors arranged opposite to each other, the two linear motors being respectively mounted on the support frame and connected to both ends of the base plate.

[0018] As a further improvement of the present invention, it also includes a frame mechanism, which includes a plurality of frames spaced apart in a vertical direction, each of the frames surrounding the spring mechanism.

[0019] As a further improvement of the present invention, each of the frames is provided with a plurality of rollers, which contact the side plate and are capable of rolling along the side plate.

[0020] As a further improvement of the present invention, the side plate has an I-shaped cross-section.

[0021] As a further improvement of the present invention, the spring mechanism includes four springs located at the four corners of the substrate.

[0022] The beneficial effects of this invention are:

[0023] (1) The present invention, through the cooperative arrangement of the base plate, mass block, lead screw assembly and flywheel, can drive the flywheel to rotate to provide inertial capacity, so that the device can have a larger additional mass without increasing the mass block mass, and can generate a larger inertial force response, thereby significantly improving the low-frequency energy coupling efficiency of the device. At the same time, the frequency of the mass block can be adjusted to match the frequency of different types of bridges, thereby realizing the excitation or vibration reduction of different bridges.

[0024] (2) This invention integrates active excitation, passive vibration reduction, and standby resistance damping energy dissipation functions into a single device. This allows the same device to output controllable excitation with ultra-low frequency, large amplitude, and wide bandwidth during the bridge inspection stage, effectively meeting the identification requirements of the bridge's natural frequency, damping ratio, mode shape, and other dynamic characteristics, thus improving the bridge's dynamic characteristic identification capability. Simultaneously, it can provide additional resistance damping and vibration reduction for wind-induced vibrations during the bridge operation stage. Therefore, this invention not only achieves the functional unification of bridge dynamic characteristic identification and mechanical vibration reduction during operation, but also improves the device's overall vibration reduction performance, engineering applicability, and on-site deployment efficiency, thereby enhancing the safety, comfort, and long-term operational reliability of the bridge structure in complex service environments.

[0025] (3) Through the coordinated coupling design of the motor drive mechanism, lead screw assembly, mass block and elastic mechanism, the present invention enables the device to achieve controllable output under active excitation conditions, and to form an additional damping effect similar to resistive damping under standby and vibration reduction conditions. In other words, the motor drive mechanism in the present invention is not only an excitation drive element, but also a component of the vibration reduction energy dissipation link, and has both driving and damping attributes.

[0026] (4) This invention is applicable to ultra-low frequency vibration conditions of long-span bridges. Through a structural arrangement with adjustable frequency, large stroke, and controllable reciprocating motion of the mass block, it can better match the characteristics of low main frequency and continuous control requirements of long-span bridges. Especially in the scenario of wind-induced vibration control of bridges, this invention does not rely solely on conventional mechanical damping, but rather combines it with electrical damping energy dissipation, giving the device higher adaptability to operating conditions and comprehensive energy dissipation capability. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a preferred embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the working state of the spring mechanism during stretching according to a preferred embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the working state of the spring mechanism during compression according to a preferred embodiment of the present invention;

[0031] In the diagram: 1. Support frame, 11. Inner support frame, 111. Base, 112. Vertical side plate, 113. Horizontal support plate, 12. Outer support frame, 121. Bearing plate, 2. Motor drive mechanism, 21. Linear motor, 3. Base plate, 4. Mass block, 5. Lead screw assembly, 51. Lead screw nut, 52. Lead screw, 6. Flywheel, 7. Spring mechanism, 71. Spring, 81. Frame. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0033] Please see Figure 1 This application discloses an integrated vibration excitation and damping device, including a support frame 1, a motor drive mechanism 2, a base plate 3, a mass block 4, a lead screw assembly 5, a flywheel 6, and a spring mechanism 7. The support frame 1 is used for installation on a bridge structure. The motor drive mechanism 2 is disposed on the support frame 1. The base plate 3 is connected to the motor drive mechanism 2 and is driven by the motor drive mechanism 2 to perform vertical reciprocating motion. The mass block 4 is installed in the middle of the base plate 3 and moves with the base plate 3. The lead screw assembly 5 includes a lead screw nut 51 and a lead screw 52 that cooperates with the lead screw nut 51. The lead screw nut 51 is disposed on the support frame 1, and the lead screw 52 is connected to the mass block 4. Through the vertical linear reciprocating motion of the base plate 3, the mass block 4 and the lead screw 51 move vertically and linearly together. The linear motion of the lead screw 51 causes the lead screw nut 51 to rotate. The flywheel 6 is rotatably sleeved on the lead screw 51 and connected to the lead screw nut 51. When the lead screw nut 51 rotates, it drives the flywheel 6 to rotate. The spring mechanism 7 includes a plurality of springs 71, one end of each spring 71 being connected to the base plate 3 and the other end being connected to the bottom of the support frame 1.

[0034] This invention uses a motor drive mechanism 2 to drive a mass block 4 in a vertical reciprocating motion. Under the constraint of a spring 71, a periodic inertial force is generated and transmitted to the bridge structure through the connection between the device and the bridge. This achieves fixed-frequency, sweep-frequency, or random excitation of the bridge, causing it to respond with vibrations. This vibration is used to identify the bridge's natural frequency, damping ratio, and mode shape, among other dynamic characteristic parameters. When the bridge experiences wind-induced vibration, the mass block 4 reciprocates under the bridge's drive, causing the permanent magnet of the motor drive mechanism 2 to move relative to the coil, cutting magnetic field lines and generating an induced current. This induced current forms a reverse electromagnetic force in the circuit, acting as resistive damping, converting the bridge's mechanical energy into electrical energy and dissipating it, thereby effectively attenuating the amplitude. This invention achieves a unified function of identifying the dynamic characteristics of bridge active vibration and mechanical vibration reduction during operation. It also improves the overall vibration reduction performance, engineering applicability, and on-site deployment efficiency of the equipment, thereby enhancing the safety, comfort, and long-term operational reliability of the bridge structure in complex service environments. Simultaneously, the present invention drives the base plate 3 and the mass block 4 to reciprocate vertically via the motor drive mechanism 2. The mass block 4 then drives the lead screw 52 to reciprocate vertically, and the rotation of the lead screw nut 51 drives the flywheel 6 to rotate. The moment of inertia R of the flywheel 6 is amplified by the lead R to the equivalent inertial capacity R = R / R. 2 The lead φ is the vertical stroke of the lead screw 51, and this equivalent inertial capacity is equivalent to the added mass. The rotation of the flywheel 6 provides the inertial capacity, allowing the device to have a larger added mass without increasing the mass of the mass block 4, thus generating a larger inertial force response and significantly improving the low-frequency energy coupling efficiency of the device. In this way, the inertial capacity provided by the flywheel 6 allows adjustment of the frequency of the mass block 4 to match the frequency of different types of bridges, thereby enabling excitation or vibration reduction of different bridges. When the bridge's main frequency is extremely low, the frequency of the mass block 4 can be lowered by changing the flywheel 6 to achieve matching with the bridge's main frequency.

[0035] In this embodiment, the support frame 1 includes an inner support frame 11 and an outer support frame 12 connected to the inner support frame 11. A lead screw nut 51 is disposed on the inner support frame 11, and a motor drive mechanism 2 is disposed on the outer support frame 12. By independently setting the inner support frame 11 and the outer support frame 12 and then connecting them together, it is convenient to assemble the support frame 1 and install other components onto the inner support frame 11 and the outer support frame 12 respectively.

[0036] Preferably, the inner support frame 11 includes a base 111, two vertical side plates 112 connected to the base 111 and arranged opposite to each other, and a transverse support plate 113 connected to the two vertical side plates 112. The lead screw nut 51 is disposed on the transverse support plate 113, and the transverse support plate 113 is located above the base plate 3.

[0037] To avoid tilting of the substrate 3, it is preferable that the substrate 3 is sleeved on the two vertical side plates 112, and the two vertical side plates 112 guide and limit the substrate 3.

[0038] Preferably, the outer support frame 12 includes two support plates 121 arranged opposite to each other. One end of each support plate 121 is connected to the corresponding vertical side plate 112, and the other end is connected to the base 111. The motor drive mechanism 2 is arranged on the two support plates 121.

[0039] In this embodiment, the motor drive mechanism 2 includes two linear motors 21 arranged opposite each other. The two linear motors 21 are respectively mounted on the support frame 1 and connected to both ends of the base plate 3. Specifically, the stator of each linear motor 21 is fixed to the bearing plate 121 of the outer support frame 12, and the mover is fixedly connected to the end of the base plate 3. It is understood that the motor drive mechanism is not limited to linear motors, but can also be a combination structure of a motor and a gear and rack assembly, or a combination structure of a motor and a lead screw assembly.

[0040] To prevent the spring mechanism 7 from tilting during tension or compression, a frame mechanism is also included. This frame mechanism comprises multiple frames 81 spaced apart vertically, each frame 81 surrounding the spring mechanism 7. To further ensure the stability of the frame mechanism's positioning, each frame 81 is preferably equipped with multiple rollers (not shown in the figure). These rollers contact the side plate 112 and are capable of rolling along it. Preferably, the side plate 112 has an I-shaped cross-section, providing good stability and facilitating the rolling of multiple rollers on multiple sides of the side plate 112.

[0041] Preferably, the spring mechanism 7 includes four springs 71 located at the four corners of the base plate 3 to facilitate the provision of constraint and restoring forces. In use, the frame 81 can be engaged between adjacent spring coils of the springs 71, following the movement of the springs 71 and providing a limit for their movement. Further, the springs 71 are helical steel springs.

[0042] During operation, the device of this invention achieves coordinated operation of active excitation, resistive damping energy dissipation, and passive vibration reduction through the coupling effect between the motor drive mechanism 2, the mass block 4, the lead screw assembly 5, and the spring mechanism 7. Its working principle is as follows:

[0043] In active vibration mode, the control unit sends a control signal to the linear motor 21, which starts and drives the base plate 3 to perform vertical reciprocating motion. The base plate 3 then drives the mass block 4 and the lead screw 52 to perform vertical reciprocating motion, causing the lead screw nut 51 to rotate and drive the flywheel 6 to rotate. During one complete vibration cycle, when the mass block 4 moves upward, the spring 71 is stretched, such as... Figure 2 As shown; when mass block 4 moves downward, spring 71 is compressed, as... Figure 3As shown. The rotation of flywheel 6 provides inertial capacity, and mass block 4 generates periodic inertial force under the constraint of spring 71. This force is transmitted to the bridge structure through the connection between the device and the bridge to achieve fixed-frequency, sweep-frequency, or random excitation of the bridge, causing the bridge to produce responsive vibration. This is used to identify the dynamic characteristic parameters of the bridge, such as its natural frequency, damping ratio, and mode shape.

[0044] In standby damping mode, linear motor 21 stops actively driving but remains connected to the energy dissipation circuit. Mass block 4 reciprocates under the vibration of the bridge, causing the permanent magnet and coil to move relative to each other, cutting magnetic field lines and generating an induced current. This induced current forms a reverse electromagnetic force in the circuit, which acts as a damping force, converting the mechanical energy of the bridge into electrical energy and dissipating it, thereby effectively attenuating the amplitude.

[0045] In passive vibration reduction mode, when the bridge vibrates due to wind load, the mass block 4, spring 71, and resistor damper work together to absorb and dissipate the mechanical energy input to the bridge. The combined effect of multiple energy dissipation mechanisms reduces the amplitude of the bridge vibration and improves the structural stability.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0047] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An integrated excitation and damping device, characterized in that, include: Support frame; The motor drive mechanism is mounted on the support frame; The substrate is connected to the motor drive mechanism and is driven by the motor drive mechanism to perform vertical reciprocating motion; A mass block is installed in the middle of the substrate; A lead screw assembly includes a lead screw nut and a lead screw that mates with the lead screw nut, the lead screw nut being disposed on the support frame, and the lead screw being connected to the mass block; A flywheel is rotatably mounted on the lead screw and connected to the lead screw nut; A spring mechanism comprising a plurality of springs, each spring having one end connected to the base plate and the other end connected to the bottom of the support frame.

2. The integrated excitation and damping device according to claim 1, characterized in that, The support frame includes an inner support frame and an outer support frame connected to the inner support frame. The lead screw nut is disposed on the inner support frame, and the motor drive mechanism is disposed on the outer support frame.

3. The integrated excitation and damping device according to claim 2, characterized in that, The inner support frame includes a base, two vertical side plates connected to the base and arranged opposite to each other, and a horizontal support plate connected to the two vertical side plates. The lead screw nut is disposed on the horizontal support plate, and the horizontal support plate is located above the base plate.

4. The integrated excitation and damping device according to claim 3, characterized in that, The substrate is fitted over the two vertical side plates.

5. The integrated excitation and damping device according to claim 3, characterized in that, The outer support frame includes two support plates arranged opposite each other. One end of each support plate is connected to the corresponding vertical side plate, and the other end is connected to the base. The motor drive mechanism is disposed on the two support plates.

6. The integrated excitation and damping device according to claim 1 or 5, characterized in that, The motor drive mechanism includes two linear motors arranged opposite each other, which are respectively mounted on the support frame and connected to both ends of the base plate.

7. The integrated excitation and damping device according to claim 1, characterized in that, It also includes a frame mechanism, which comprises a plurality of frames spaced apart in a vertical direction, each of which surrounds the spring mechanism.

8. The integrated excitation and damping device according to claim 7, characterized in that, Each of the frames is provided with multiple rollers, which contact the side plate and are able to roll along the side plate.

9. The integrated excitation and damping device according to claim 8, characterized in that, The side plate has an I-shaped cross-section.

10. A vibration damping integrated device according to claim 1 or 7, characterized in that, The spring mechanism includes four springs, which are located at the four corners of the substrate.

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